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<a href="cfg__manager__fwd_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1cfg.html">flow::cfg</a></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span>{</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">// Find doc headers near the bodies of these compound types.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span>... S_d_value_set&gt;</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="keyword">class </span>Config_manager;</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value_set&gt;</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="keyword">struct </span>Final_validator_func;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="keyword">struct </span>Null_value_set;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Value_set&gt;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="keyword">class </span>Static_config_manager;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"></span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">/**</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * Result enumeration for a Final_validator_func::Type function which is used by a Config_manager user</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * when parsing a config source (ex: file).  In short such a function can consider the file as one to skip</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> * entirely, as okay to accept, or as erroneous.</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> */</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"><a class="line" href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3">   43</a></span><span class="keyword">enum class</span> <a class="code hl_enumeration" href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3">Final_validator_outcome</a></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>{<span class="comment"></span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment">   * The holistically-checked cumulative `Value_set` has no problems and shall be accepted into the candidate</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment">   * `Value_set`; if this is the final config-source (ex: file), that candidate shall be canonicalized.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment">   * `apply_*()` shall return `true` (success).</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment">   */</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  <a class="code hl_enumvalue" href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3a655ec6aa779cb1c799c9ba80f24e9567">S_ACCEPT</a>,</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"></span> </div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * The holistically-checked cumulative `Value_set` has contents such that the validator function decided</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   * that the *current* `apply_*()` shall have no effect, meaning the `Value_set` candidate shall remain</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * unchanged from just-before that *current* `apply_*()`; if this is the final config-source (ex: file),</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * that unchanged candidate shall be canonicalized.  `apply_*()` shall return `true` (success).</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   *</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   * `S_SKIP` shall also have this effect on all subsequently scanned `Value_set`s in the same</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment">   * `apply_static()`, `apply_dynamic()`, or `apply_static_and_dynamic()` call; that is to say</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment">   * one SKIPped `Value_set` causes all subsequent ones to behave as-if they too were SKIPped.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">   */</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>  <a class="code hl_enumvalue" href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3ace64a8fc2c16fb21be22f603ef4d2eec">S_SKIP</a>,</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"></span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment">   * The holistically-checked cumulative `Value_set` has invalid contents; the candidate shall be rejected,</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">   * and `apply_*()` shall return `false` (failure).</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment">   */</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>  <a class="code hl_enumvalue" href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3aec1a4aed91659725c96b0b8378dba316">S_FAIL</a></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>}; <span class="comment">// enum class Final_validator_outcome</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span> </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">// Free functions.</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"></span> </div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">/**</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * Serializes (briefly) a Config_manager to a standard output stream.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> *</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * @relatesalso Config_manager</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> *</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * @tparam S_d_value_set</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> *         See Config_manager doc header.</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * @param os</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> *        Stream to which to serialize.</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * @param val</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> *        Value to serialize.</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> * @return `os`.</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> */</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span>... S_d_value_set&gt;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>std::ostream&amp; <a class="code hl_function" href="namespaceflow_1_1cfg.html#af310e567f2763a9736eda686030e6311">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> Config_manager&lt;S_d_value_set...&gt;&amp; val);</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>} <span class="comment">// namespace flow::cfg</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">// Macros.</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"></span> </div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">/**</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> * Convenience macro particularly useful in the `final_validator_func()` callback taken by various</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> * Config_manager APIs; checks the given condition; if `false` logs a FLOW_LOG_WARNING() containing the failed</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> * condition and executes `outcome = flow::cfg::Final_validator_func::S_FAIL;`; otherwise no-op.  Note the context</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> * must be such that FLOW_LOG_WARNING() compiles and acts properly.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> *</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> * If `auto outcome = flow::cfg::Final_validator_func::S_ACCEPT;` precedes multiple invocations of this macro, then</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> * by the end of those invocations `outcome == S_ACCEPT` if and only if all checks passed.  All errors will be printed</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> * if `outcome != S_ACCEPT`.</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment"> *</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> * Informally: If you have a condition that would cause your `final_validator_func()` to return</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> * flow::cfg::Final_validator_outcome::S_SKIP, then it is probably best to check for this potential condition,</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> * and `return flow::cfg::Final_validator_outcome::S_SKIP` if it holds, before any further checks</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> * (FLOW_CFG_OPT_CHECK_ASSERT() calls).</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> *</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> * @param ARG_must_be_true</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment"> *        An expression convertible to `bool` that should evaluate to `true` to avoid WARNING and `outcome = S_FAIL;`.</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment"> */</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"><a class="line" href="cfg__manager__fwd_8hpp.html#a1e8c66781034dd50ad8e2de9c0c47e0e">  111</a></span><span class="preprocessor">#define FLOW_CFG_OPT_CHECK_ASSERT(ARG_must_be_true) \</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="preprocessor">  FLOW_UTIL_SEMICOLON_SAFE \</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="preprocessor">    ( \</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="preprocessor">      if (!(ARG_must_be_true)) \</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="preprocessor">      { \</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="preprocessor">        FLOW_LOG_WARNING(&quot;Validation failed; the following condition must hold: [&quot;</span> #ARG_must_be_true &quot;].&quot;); \</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>        outcome = ::flow::cfg::Final_validator_outcome::S_FAIL; \</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>      } \</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>    )</div>
<div class="ttc" id="anamespaceflow_1_1cfg_html"><div class="ttname"><a href="namespaceflow_1_1cfg.html">flow::cfg</a></div><div class="ttdoc">Flow module that facilitates configuring modules, such as applications and APIs, via statically and/o...</div><div class="ttdef"><b>Definition:</b> <a href="cfg__fwd_8hpp_source.html#l00111">cfg_fwd.hpp:112</a></div></div>
<div class="ttc" id="anamespaceflow_1_1cfg_html_a80b3319f3d3a657837d0d8b28d22ccc3"><div class="ttname"><a href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3">flow::cfg::Final_validator_outcome</a></div><div class="ttdeci">Final_validator_outcome</div><div class="ttdoc">Result enumeration for a Final_validator_func::Type function which is used by a Config_manager user w...</div><div class="ttdef"><b>Definition:</b> <a href="cfg__manager__fwd_8hpp_source.html#l00043">cfg_manager_fwd.hpp:44</a></div></div>
<div class="ttc" id="anamespaceflow_1_1cfg_html_a80b3319f3d3a657837d0d8b28d22ccc3a655ec6aa779cb1c799c9ba80f24e9567"><div class="ttname"><a href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3a655ec6aa779cb1c799c9ba80f24e9567">flow::cfg::Final_validator_outcome::S_ACCEPT</a></div><div class="ttdeci">@ S_ACCEPT</div><div class="ttdoc">The holistically-checked cumulative Value_set has no problems and shall be accepted into the candidat...</div></div>
<div class="ttc" id="anamespaceflow_1_1cfg_html_a80b3319f3d3a657837d0d8b28d22ccc3ace64a8fc2c16fb21be22f603ef4d2eec"><div class="ttname"><a href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3ace64a8fc2c16fb21be22f603ef4d2eec">flow::cfg::Final_validator_outcome::S_SKIP</a></div><div class="ttdeci">@ S_SKIP</div><div class="ttdoc">The holistically-checked cumulative Value_set has contents such that the validator function decided t...</div></div>
<div class="ttc" id="anamespaceflow_1_1cfg_html_a80b3319f3d3a657837d0d8b28d22ccc3aec1a4aed91659725c96b0b8378dba316"><div class="ttname"><a href="namespaceflow_1_1cfg.html#a80b3319f3d3a657837d0d8b28d22ccc3aec1a4aed91659725c96b0b8378dba316">flow::cfg::Final_validator_outcome::S_FAIL</a></div><div class="ttdeci">@ S_FAIL</div><div class="ttdoc">The holistically-checked cumulative Value_set has invalid contents; the candidate shall be rejected,...</div></div>
<div class="ttc" id="anamespaceflow_1_1cfg_html_af310e567f2763a9736eda686030e6311"><div class="ttname"><a href="namespaceflow_1_1cfg.html#af310e567f2763a9736eda686030e6311">flow::cfg::operator&lt;&lt;</a></div><div class="ttdeci">std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Option_set&lt; Value_set &gt; &amp;val)</div><div class="ttdoc">Serializes (briefly) an Option_set to a standard output stream.</div><div class="ttdef"><b>Definition:</b> <a href="option__set_8hpp_source.html#l02154">option_set.hpp:2154</a></div></div>
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